/*
 * @Author: your name
 * @Date: 2020-12-28 10:35:58
 * @LastEditTime: 2020-12-28 10:36:21
 * @LastEditors: Please set LastEditors
 * @Description: In User Settings Edit
 * @FilePath: \testc++\swap.h
 */
void swap(int &val1, int &val2);
